1 //===- Strings.cpp -------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "lld/Common/Strings.h" 10 #include "lld/Common/ErrorHandler.h" 11 #include "lld/Common/LLVM.h" 12 #include "llvm/Support/FileSystem.h" 13 #include "llvm/Support/GlobPattern.h" 14 #include <algorithm> 15 #include <mutex> 16 #include <vector> 17 18 using namespace llvm; 19 using namespace lld; 20 21 SingleStringMatcher::SingleStringMatcher(StringRef Pattern) { 22 if (Pattern.size() > 2 && Pattern.startswith("\"") && 23 Pattern.endswith("\"")) { 24 ExactMatch = true; 25 ExactPattern = Pattern.substr(1, Pattern.size() - 2); 26 } else { 27 Expected<GlobPattern> Glob = GlobPattern::create(Pattern); 28 if (!Glob) { 29 error(toString(Glob.takeError())); 30 return; 31 } 32 ExactMatch = false; 33 GlobPatternMatcher = *Glob; 34 } 35 } 36 37 bool SingleStringMatcher::match(StringRef s) const { 38 return ExactMatch ? (ExactPattern == s) : GlobPatternMatcher.match(s); 39 } 40 41 bool StringMatcher::match(StringRef s) const { 42 for (const SingleStringMatcher &pat : patterns) 43 if (pat.match(s)) 44 return true; 45 return false; 46 } 47 48 // Converts a hex string (e.g. "deadbeef") to a vector. 49 SmallVector<uint8_t, 0> lld::parseHex(StringRef s) { 50 SmallVector<uint8_t, 0> hex; 51 while (!s.empty()) { 52 StringRef b = s.substr(0, 2); 53 s = s.substr(2); 54 uint8_t h; 55 if (!to_integer(b, h, 16)) { 56 error("not a hexadecimal value: " + b); 57 return {}; 58 } 59 hex.push_back(h); 60 } 61 return hex; 62 } 63 64 // Returns true if S is valid as a C language identifier. 65 bool lld::isValidCIdentifier(StringRef s) { 66 return !s.empty() && !isDigit(s[0]) && 67 llvm::all_of(s, [](char c) { return isAlnum(c) || c == '_'; }); 68 } 69 70 // Write the contents of the a buffer to a file 71 void lld::saveBuffer(StringRef buffer, const Twine &path) { 72 std::error_code ec; 73 raw_fd_ostream os(path.str(), ec, sys::fs::OpenFlags::OF_None); 74 if (ec) 75 error("cannot create " + path + ": " + ec.message()); 76 os << buffer; 77 } 78